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Pawel Kiczko 2020-05-16 11:59:01 +03:00
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18_Day/18_regular_expression.md
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![30DaysOfPython](../images/30DaysOfPython_banner3@2x.png)
- [📘 Day 18](#%f0%9f%93%98-day-18)
- [Regular Expression](#regular-expression)
- [Import re module](#import-re-module)
- [Regular Expressions](#regular-expression)
- [The *re* module](#The-re-module)
- [re functions](#re-functions)
- [Match](#match)
- [Search](#search)
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- [Escape character(\\) in RegEx](#escape-character-in-regex)
- [One or more times(+)](#one-or-more-times)
- [Period(.)](#period)
- [Zero or more times(*)](#zero-or-more-times)
- [Zero or more times(\*)](#zero-or-more-times)
- [Zero or one times(?)](#zero-or-one-times)
- [Quantifier in RegEx](#quantifier-in-regex)
- [Cart ^](#cart)
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A regular expression or RegEx is a small programming language that helps to find pattern in data. A RegEx can be used to check if some pattern exists in a different data type. To use RegEx in python first we should import the RegEx module which is *re*.
### Import re module
After importing the module we can use it to detect or find patterns.
```py
import re